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Threshold Crossing Alerts Tab

Configuration > Templates & Policies > TCAs > Threshold Crossing Alerts

Threshold Crossing Alerts (TCAs) are pre-emptive, configurable alarms triggered when specific thresholds are crossed.

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The alerts are triggered with rising and falling threshold crossing events (that is, floor and ceiling levels). For both levels, one value raises the alarm while another value clears it.

  • When you configure appliance and tunnel TCAs with an Orchestrator template, all alerts apply globally, so all of an appliance’s tunnels have the same alerts.

  • To create a tunnel-specific alert, navigate to Configuration > Networking > Tunnels> Tunnels, select the tunnel, click the edit icon to access the tunnel directly, and then click the icon in the Alert Options column. Make your changes, and then click OK.

Times to Trigger – A value of 1 triggers an alarm on the first threshold crossing instance.

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ON by Default

  • Appliance Capacity – Triggers when an appliance reaches 95% of its total flow capacity. It is not configurable and can be cleared only by an operator.

  • File-system utilization – Percent of non-Network Memory disk space filled by the appliance. This TCA cannot be disabled.

  • Tunnel latency – Measured in milliseconds, the maximum latency of a one-second sample within a 60-second span.

OFF by Default

  • LAN-side receive throughput – Based on a one-minute average, the LAN-side receive TOTAL for all interfaces.

  • WAN-side transmit throughput – Based on a one-minute average, the WAN-side transmit TOTAL for all interfaces.

  • TCAs based on an end-of-minute count:

    • Total number of flows

    • Total number of optimized flows

  • TCAs based on a one-minute average:

    • Tunnel loss post-FEC

    • Tunnel loss post-FEC

    • Tunnel OOP post-POC

    • Tunnel OOP post-POC

    • Tunnel reduction

    • Tunnel utilization (based on percent of configured maximum [system] bandwidth)

Threshold Crossing Alerts Edit Row

Click any cell in the table to edit and configure the Threshold Crossing Alerts.

This table lists the defaults of each type of threshold crossing alert:

TCA Name Default
[ON or OFF]
Default Values
[Rising Raise; Rising Clear; Falling Raise; Falling Clear]
allow rising allow falling
Appliance Level        
WAN-side transmit throughput OFF 1 Gbps; 1 Gbps; 0; 0 4 4
LAN-side receive throughput OFF 1 Gbps; 1 Gbps; 0; 0 4 4
Total number of optimized flows OFF 256,000, 256,000; 0; 0 4 4
Total number of flows OFF 256,000, 256,000; 0; 0 4 4
File-system-utilization ON (cannot be disabled) 95%; 85%; 0%; 0% 4
Tunnel Level        
Tunnel latency ON 1000; 850; 0; 0 4
Tunnel loss pre-FEC OFF 100%; 100%; 0%; 0% 4
Tunnel loss post-FEC OFF 100%; 100%; 0%; 0% 4
Tunnel OOP pre-POC OFF 100%; 100%; 0%; 0% 4
Tunnel OOP post-POC OFF 100%; 100%; 0%; 0% 4
Tunnel utilization OFF 95%; 90%; 0%; 0% 4 4
Tunnel reduction OFF 100%; 100%; 0%; 0% 4

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